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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.gallery3d.app;
     18 
     19 import android.app.Application;
     20 import android.content.Context;
     21 import android.os.AsyncTask;
     22 
     23 import com.android.gallery3d.data.DataManager;
     24 import com.android.gallery3d.data.DownloadCache;
     25 import com.android.gallery3d.data.ImageCacheService;
     26 import com.android.gallery3d.gadget.WidgetUtils;
     27 import com.android.gallery3d.picasasource.PicasaSource;
     28 import com.android.gallery3d.util.GalleryUtils;
     29 import com.android.gallery3d.util.LightCycleHelper;
     30 import com.android.gallery3d.util.ThreadPool;
     31 import com.android.gallery3d.util.UsageStatistics;
     32 
     33 import java.io.File;
     34 
     35 public class GalleryAppImpl extends Application implements GalleryApp {
     36 
     37     private static final String DOWNLOAD_FOLDER = "download";
     38     private static final long DOWNLOAD_CAPACITY = 64 * 1024 * 1024; // 64M
     39 
     40     private ImageCacheService mImageCacheService;
     41     private Object mLock = new Object();
     42     private DataManager mDataManager;
     43     private ThreadPool mThreadPool;
     44     private DownloadCache mDownloadCache;
     45 
     46     @Override
     47     public void onCreate() {
     48         super.onCreate();
     49         initializeAsyncTask();
     50         GalleryUtils.initialize(this);
     51         WidgetUtils.initialize(this);
     52         PicasaSource.initialize(this);
     53         UsageStatistics.initialize(this);
     54     }
     55 
     56     @Override
     57     public Context getAndroidContext() {
     58         return this;
     59     }
     60 
     61     @Override
     62     public synchronized DataManager getDataManager() {
     63         if (mDataManager == null) {
     64             mDataManager = new DataManager(this);
     65             mDataManager.initializeSourceMap();
     66         }
     67         return mDataManager;
     68     }
     69 
     70 
     71     @Override
     72     public ImageCacheService getImageCacheService() {
     73         // This method may block on file I/O so a dedicated lock is needed here.
     74         synchronized (mLock) {
     75             if (mImageCacheService == null) {
     76                 mImageCacheService = new ImageCacheService(getAndroidContext());
     77             }
     78             return mImageCacheService;
     79         }
     80     }
     81 
     82     @Override
     83     public synchronized ThreadPool getThreadPool() {
     84         if (mThreadPool == null) {
     85             mThreadPool = new ThreadPool();
     86         }
     87         return mThreadPool;
     88     }
     89 
     90     @Override
     91     public synchronized DownloadCache getDownloadCache() {
     92         if (mDownloadCache == null) {
     93             File cacheDir = new File(getExternalCacheDir(), DOWNLOAD_FOLDER);
     94 
     95             if (!cacheDir.isDirectory()) cacheDir.mkdirs();
     96 
     97             if (!cacheDir.isDirectory()) {
     98                 throw new RuntimeException(
     99                         "fail to create: " + cacheDir.getAbsolutePath());
    100             }
    101             mDownloadCache = new DownloadCache(this, cacheDir, DOWNLOAD_CAPACITY);
    102         }
    103         return mDownloadCache;
    104     }
    105 
    106     private void initializeAsyncTask() {
    107         // AsyncTask class needs to be loaded in UI thread.
    108         // So we load it here to comply the rule.
    109         try {
    110             Class.forName(AsyncTask.class.getName());
    111         } catch (ClassNotFoundException e) {
    112         }
    113     }
    114 }
    115